By"languageacquisitionisprimarilytheacquistionofthegrammaticalsystemoflanguage",linguistsmeanthat______.
D
当我们说语言的习得基本上是语言的语法系统习得的时候，我们并不是说语言的语法系统内的每一个具体的规则都需要习得。实际上，儿童习得的是使言语合乎语法规范所必需的一些具有普遍意义的规则。我们注意到，在生成话语时，儿童倾向使用普遍的语法规则，而排斥个别的不规则的情况。
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
A linguistic theory is constructed about what ______ is and how it works.
The volunteers would rather go by train than ________.
Ifyouarewalkingawayfromaclocktower，youwillhearthetickingoftheclockfadetoapoint________itcannotbeheard.